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  • Chemistry  (54)
  • Organic Chemistry  (12)
  • 1955-1959  (54)
  • 1958  (54)
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  • 1955-1959  (54)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 31 (1958), S. 319-326 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Results obtained in the investigation of polymers containing pentavalent phosphorus in the main polymer chain are presented. A number of polyamides and polyesters derived from phosphorus-containing dicarboxylic acids have been synthesized. Two types of dicarboxylic acids were used: alkyl- or aryl-phosphinic acids (I) and bis-carboxyphenyl-phosphine oxides (II): their chloroanhydrides or esters being used in the reaction. To obtain polyesters, various glycols or dihydric phenols were used as the second component. For preparing polyamides, aliphatic diamines were used as the second component. The nature of the starting materials has a very marked effect on the properties of the polymers obtained. Polyesters with an aliphatic chain are viscous, thick oils or low-melting resins. Polyesters with aromatic unit are high-melting, solid elastic substances. Comparison of the properties of the polymers synthesized by us with the properties of polymers of related composition not containing phosphorus, shows that the introduction of phosphorus into the chain leads to molecules of much greater flexibility. For this reason the softening points of the phosphorus-containing polymers are much lower than those of their carbon analogues.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 30 (1958), S. 297-314 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In this paper are presented new results obtained during further experimental and theoretical investigations of the form effect in the dynamic double refraction of polymers in solution. The use of the dumbbell theory of W. Kuhn for flexible chains in solution and of the optical modle of an equivalent ellipsoid for the macromolecule, permits the formulation of a theory of flow birefringence which takes account of the form effect for a wide range of shear rates. The conclusions of this theory are compared with new experimental data obtained in a study of polystyrene and p-tert-butylphenylmethacrylate in different solvents. In the range of low shear rates and concentrations, the theory is found to be in a good accord with experimental results. On the contrary, the study of the double refraction of several polystyrene fractions in dioxane in a wide range of shear rates and concentrations shows that macromolecules are less deformable in the flow than it follows from the dumbbell theory for ideally flexible chains. A new phenomenon was discovered experimentally - an anomalous dependence of the orientation angle on the shear rate of flow in the range of shear stresses at which the birefringence changes its sign because of compensation of the positive shape effect by the negative intrinsic anisotropy effect. Investigation of the concentration dependence of flow birefringence shows that this dependence is due to two causes - the hydrodynamic and optical interaction of the molecules. The optical interaction is characteristic only for those solutions in which the form effect takes place. A simple theory of concentration dependence of the form effect is proposed which is in good accordance with experimental data.
    Additional Material: 12 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 76-82 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Elchemographic Measurements in Corrosion ResearchThe effects of corrosion and passivity on metals and their alloys can be described and explained in certain cases by means of experimentally established electro chemical theories. For these and other electro chemical problems an elchemographic design has been experienced. This apparatus allows a continuous photographic recording of potentials and currents under eligible modification of the conditions of polarization.Elchemographic measurements are based on electrode polarizations by means of discontinuous currents which can be modified over a wide range.Polarization by means of discontinuous current makes it possible to measure the electrode potential in the dead state. This is of great importance to the research of corrosion and passivity as well as of transient resistants which generate the Ohm voltage and the well known component of the potentials measured under polarization.The elchemographic measurements have been extended to capacitive systems. In this connection the influences of a capacity on polarization current and potential were investigated. The results can be used in connection with the theory of local cells. (Influence of a capacity between two equipotential areas.)
    Notes: Die an Metallen und deren Legierungen beobachteten Korrosions- und Passivitätserscheinungen kann man in bestimmten Fällen durch experimentell belegte elektrochemische Anschauungen treffend beschreiben und erklären. Hierbei und auch bei anderen elektrochemischen Geschehen, bewahrte sich eine elchemographische Vorrichtung, die eine kontinuierliche photographische Registrierung der Potential- und Stromwerte bei wählbaren Änderungen der Polarisationsbedingungen ermöglicht.Elchemographische Messungen basieren auf einer Elektrodenpolarisation mit unterbrochenem Strom von rechteckartigem Verlauf unter Bedingungen, die es gestatten, den Polarisationsstrom weitgehend zu ändem.Die Polarisation mit unterbrochenem Gleichstrom ermöglicht die Bestimmung des Elektrodenpotentials in stromlosem Zustand, das für Korrosions- und Passivitätserscheinungen grundlegende Bedeutung, ebenso wie die vorübergehenden Widerstände, welche die Ohmsche Spannung bedingen und die gewohnte Komponente der an polarisierten Elektroden gemessenen Potentialwerte darstellen.Die elchemographischen Messungen wurden auf kapazitative Systeme ausgedehunt, in diesem Zusammenhang wurde der Einfluß einer Kapazität auf Polarisationsstrom und Potential untersucht. Die Versuchsergebnisse kann man im Zusammenhang mit der Konzeption der Lokalelemente (Eingriff einer Kapazität zwischen zwei äquipotentialen Flächen) anwenden.
    Additional Material: 11 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 9 (1958), S. 262-265 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Vibration Method to Detect Modifications in WoodThe authors investigated the influence of an impregnation by a synthetic resin or boric acid, a watering and the effects of alkali and mineral acids upon the torsional fatigue strength (modulus of elasticity in shear and logarithmic decrement) of numerous exotic hard and soft wood. While an impregnation makes the modulus of elasticity in shear raise watering and boric acid treatments diminish the logarithmic decrement but cause high torsional fatigue strength. The alkali resistance of numerous wood is generally much lower than their resistance to acids.
    Notes: Die Verfasser studierten den Einfluß einer Imprägnierung mit Kunstharz oder Borsäure, einer Wasserlagerung und der Einwirkung von Lauge und Mineralsäure auf die Torsionsschwingungsfestigkeit (Gleitmodul und logarithmisches Dekrement) zahlreicher exotischer Laub- und Nadelhölzer. Während Kunstharztränkung den Gleitmodul stark erhöht, erniedrigen Wasserlagerung und Borsäurebehandlung das logarithmische Dekrement und erhöhen die Torsionsschwingungsfestigkeit. Die Laugenbeständigkeit der verschiedenen Holzarten ist im allgemeinen erheblich geringer als deren Säurebeständigkeit.
    Additional Material: 4 Ill.
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  • 5
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 70 (1958), S. 25-25 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 70 (1958), S. 98-104 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In den letzten Jahren wurden zahlreiche polarographische Untersuchungen in nichtwäßrigen Systemen ausgeführt, wobei sich einerseits verschiedene Schwierigkeiten, andererseits aber neuartige Ausblicke ergeben. Da über die Polarographie nichtwäßriger Lösungen keine vollständige Zusammenfassung vorliegt1), wird versucht, diese Lücke zu füllen; Salzschmelzen werden wegen der besonderen elektrochemischen Verhältnisse nicht behandelt.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 70 (1958), S. 644-645 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Anregung der Schriftleitung der „Angewandten Chemie“ geben wir im folgenden eine kurze Übersicht über unsere letzten Arbeiten, welche sich mit der Konstitution der Calebassen-Curare- und Strychnos-Rinden-Alkaloide beschäftigen.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 70 (1958), S. 704-704 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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